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ATmega Engine Controller
========================
The code from firmware/ is supposed to run on a ATmega48
sending servo signals to cheap brushless controllers as used
in RC models. The ATmega48 gets its instructions via a serial
line from a host system. The code in client/ is a small test
binary for the host system.
Connection
----------------
[Engine 1]--->[BLC 1]--->PB1
[Engine 2]--->[BLC 2]--->PB2
[Engine 3]--->[BLC 3]--->PB3
[Engine 4]--->[BLC 4]--->PD3
[Engine 5]--->[BLC 5]--->PD5
[Engine 6]--->[BLC 6]--->PD6
[Host TX]--->PD0
[Host RX]--->PD1
Serial Protocol
---------------
Each of the following commands will be acknowledged with
```0x2E```, which is the ASCII value for a dot. Available
commands are:
- **no operation**
This command simply does nothing. It consists of a
single byte: ```0x00```
- **enable**
Sending the bytes ```0xCA```, ```0xFE```, ```0xBA```, ```0xBE``` activates
the engine controlling. Before sending this command
the controller does not activate any engine.
- **disable**
One can disable all engines again by sending the
bytes ```0xDE```, ```0xAD```, ```0xBA```, ```0xBE```. After disabling the
engines with this command all future engine settings
will be ignored.
- **set speed (of a single engine)**
To set the speed of a single engine on has to send
two bytes: first the engine number in the system
(```0x01``` - ```0x06```), the the desired speed (```0x00```-```0xFF```).
- **set speed of all engines simultaneously**
One can also set the speed of all engines simultaneously
to the same value by first sending ```0xFF``` and then sending
a second byte with the desired speed (```0x00```-```0xFF```).
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